Pulse duration telemeter receiver



April 6, 1965 A. ROSENBAUM ETAL 3,177,477

PULSE DURATION TELEMETER RECEIVER Filed Feb. 23, 1962 2 Sheets-Sheet 1 FIG. 1

INV EN TOR.

BY m M 0 M April 6, 1965 A. ROSENBAUM ETAL 3,177,477

PULSE DURATION TELEMETER RECEIVER 2 Sheets-Sheet 2 Filed Feb. 23, 1962 [15 VOLT $0C'YC'LE ALTERNAI'ING VOLTAGE R4-Z R I -5 R5-Z l S E E V0 7 MOTOR llllllllI-IIII I III.

MOT

DOWN

RI-e R5-3 TIMING 4 MOTOR JIGIVIL FIG.2

INVENTOR.

BY M MW United States Patent Ofiice 3,177,477 PULE DURATION TELEMETER RECEIVER Arthur Rosenhaum, 13453 Weddington St., Van Nuys,

Califl; Charles E. Moody, 5224 Stratford Road, Los

Angeles, Calif.; and Edward A. Blanton, 12011 Hodman St., Studio City, Calif.

Filed Feb. 23, 1962, Ser. No. 174,997 2 Claims. (Cl, Mil-2th?) This invention is to provide a simple, electro-mechanical receiver for pulse duration modulated telemetered signals. It uses standard electrical motors, switches and relays instead of complex mechanisms or electronic devices. The invention develops a pulse which is proportional to the position of the indicator or recorder on the receiver, synchronizes this pulse with the pulse received from the distant transmitter and then appropriately repositions the receiver indicator or recorder if the two pulses do not agree in length.

FIGURE 1 shows the mechanical units in relationship to each other with the relays omitted. The position of the relays with respect to the rest of the equipment is not important.

FIGURE 2 shows the electrical relationship of the parts including the relays.

In FIGURE 1, rod 1, which is supported by arm 2 which is caused to rotate by shaft 3 which is driven by motor 4, rests on switch causing switch 5 to be actuated. With the switch in this position, the circuit to motor 4 is opened and the motor is stopped. All of the relays are deenergized.

When the leading edge of the transmitted pulse arrives, it energizes receiving relay R'-5, closing contacts R-51. This completes a circuit through the contacts of switch 5 and the normally closed contacts of R-3-2 to energize control relay R-l. This closes contacts R-1-2 and R-l-S which locks relay R-1 closed through the normally closed switch 6. At the same time contacts R-1-4 energize motor 4 causing it to rotate. Contacts R-S-l also energize control relay R-2. Contacts R-2-1 energize control relay R-3. The purpose of relay R-2 is to provide a time delay for relay R-3 and may be omitted if relay R-3 has a built-in time delay in actuating its contacts after its coil is energized. Relay R-3 and switch 5 act as a synchronizer. If the transmitted pulse arrives before rod 1 actuates switch 5, R-3-2 contacts are opened when R-3 is energized, R-1 is prevented from operating and motor 4 stops with rod 1 resting on switch 5. When the transmitted pulse ends, R-51 opens, de-energizing R-S so that the next transmitted pulse can close R1 and the receiver pulse and the transmitted pulse start at the same time.

Rod 1 is rotated by motor 4 until it actuates switch 6 which opens and de-energizes R-l. The time interval between rod 1 leaving switch 5 until rod 1 actuates switch 6 is the length of the receiver pulse. The time interval that relay R-S is energized is the length of the transmitted pulse.

Control relay R-4 provides a time delay for the up and down circuits of the reversing motor 7. Relay R-l and R-3 must be energized to operate R-4 which locks in on contacts R41 and also closes contacts 3,177,477. Patented Apr. 6, 1965 R42. If relays R-1 and R-5 are operated for the same length of time, there is no continuity in the up or down circuits to motor 7. If the transmitted pulse is longer than the receiver pulse, R-l will be de-energized while R5 is still energized, providing a path through the up circuit and causing motor 7 to revolve in the up direction. If the transmitted pulse is shorter than the receiver pulse, R1 will be energized while R5 is deenergized and the continuous path will be through the down circuit, causing motor '7 to revolve in the down direction.

When motor 7 rotates, it turns shaft 8 which turns pulley 9, pulling on cable 10. Cable 10 turns pulleys 11 and 12. Pulley 11 turns shaft 13 which positions 14. Item 14 may be an indicator moving across a dial or an arm carrying a pen across a chart. If desired, items 11, 13 and 14 could be omitted and an indicator or pen could be attached directly to cable 10. The body of switch 6 is fastened to pulley 12. Pulley 12 is pivoted on shaft 3 and positions the body of switch 6 to determine the length of the receiver pulse. Pulleys 9, 11, 12 and cable 10 could be replaced by any other mechanism, such as a set of gears, which would cause motor 7 to position the indicator, such as 14, in the proper relationship to switch 6.

The following claims are made:

1. A receiver apparatus for receiving variable width transmitted pulses and having a member positionable in accordance With the duration of a transmitted pulse comprising a receiving relay, a plurality of control relays, a timing motor, a reversible motor for positioning said positionable member, a first fixedly positioned switch, a second switch, switch operating means driven by said timing motor to operate said first and second switches, means for energizing said timing motor including a first control relay controlled by said receiving relay, said first control relay including contacts in series with and energizing said timing motor for the duration of a received transmitted pulse, means controlled by said reversible motor and positioning said second switch relative to said switch operating means, said second switch and further contacts operated by said first control relay comprising a series circuit to control the duration of energization of said control relay defining a reference receiver impulse, further control relay means in series with said first switch to provide a first start-synchronizing circuit for said timing motor, said reversible motor having up-down control field windings, said receiving relay and said first control relay each including contact means in series with each of said field windings to control the direction of rotation of said motor and the position of said positioning member.

2. The receiver as defined in claim 1, wherein the positionable member includes an indicator of pulse width.

References Cited by the Examiner UNITED STATES PATENTS 2,301,897 11/42 Lubrs 340-206 2,443,351 6/48 Green 340-206 2,752,585 6/56 Jacobson 340-206 NEIL C. READ, Primary Examiner.

THOMAS B. HABECKER, Examiner. 

1. A RECEIVER APPARATUS FOR RECEIVING VARIABLE WIDTH TRANSMITTED PULSES AND HAVING A MEMBER POSITIONABLE IN ACCORDANCE WITH THE DURATION OF A TRANSMITTED PULSE COMPRISING A RECEIVING RELAY, A PLURALITY OF CONTROL RELAYS, A TIMING MOTOR, A REVERSIBLE MOTOR FOR POSITIONING SAID POSITIONABLE MEMBER, A FIRST FIXEDLY POSITIONED SWITCH, A SECOND SWITCH, SWITCH OPERATING MEANS DRIVEN BY SAID TIMING MOTOR TO OPERATE SAID FIRST AND SECOND SWITCHES, MEANS FOR ENERGIZING SAID TIMING MOTOR INCLUDING A FIRST CONTROL RELAY CONTROLLED BY SAID RECEIVING RELAY, SAID FIRST CONTROL RELAY INCLUDING CONTACTS IN SERIES WITH AND ENERGIZING SAID TIMING MOTOR FOR THE DURATION OF A RECEIVED TRANSMITTED PULSE, MEANS CONTROLLED BY SAID REVERSIBLY MOTOR AND POSITIONING SAID SECOND SWITCH RELATIVE TO SAID SWITCH OPERATING MEANS, SAID SECOND SWITCH AND FURTHER CONTACTS OPERATED BY SAID FIRST CONTROL RELAY COMPRISING A SERIES CIRCUIT TO CONTROL THE DURATION OF ENERGIZATION OF SAID CONTROL RELAY DEFINING A REFERENCE RECEIVER IMPULSE, FURTHER CONTROL RELAY MEANS IN SERIES WITH SAID FIRST SWITCH TO PROVIDE A FIRST START-SYNCHRONIZING CIRCUIT FOR SAID TIMING MOTOR, SAID REVERSIBLE MOTOR HAVING UP-DOWN CONTROL FIELD WINDINGS, SAID RECEIVING RELAY AND SAID FIRST CONTROL RELAY EACH INCLUDING CONTACT MEANS IN SERIES WITH EACH OF SAID FIELD WINDINGS TO CONTROL THE DIRECTION OF ROTATION OF SAID MOTOR AND THE POSITION OF SAID POSITIONING MEMBER. 